Benefits

Carrier-type scale system for quick, easy installation and replacement of scale

What is VIONiC?

The VIONiC readhead combines Renishaw's market proven filtering optics and advanced interpolation into one digital incremental encoder with ultra-high accuracy. The VIONiC encoder system offers a wide variety of speed and resolution configurations, and an expansive range of linear or rotary scale options. This makes it one of the most versatile encoder for high precision feedback. Designed with intuitive auto-calibration mode, VIONiC readheads are also easy to install.

What is new?

*The VIONiC encoder system is now available in resolutions down to 2.5 nm with enhanced SDE across the product range.

What is RTLC20 scale?

RTLC20 is a low profile stainless steel tape scale featuring a 20 µm pitch and IN-TRAC customer selectable reference mark. It is accurate to ±5 µm/m and in lengths up to 10 metres (>10 metres on request). Two mounting options are available, both allow independent thermal expansion and tape scale convenience. RTLC20 can be used with the revolutionary FASTRACK™ scale carrier system. This system allows a track to be laid quickly and easily with no need for fixing holes. A sacrificial spacer is removed and the tape scale is then fed into the track.RTLC20-S is laid onto the substrate with self-adhesive backing tape. The self-adhesive is formulated in such a way that it allows for independent scale expansion to that of the substrate. To complete the installation, both types of scale are clamped at one point to provide a datum position.

Why choose this encoder system?

All purpose digital encoder system

VIONiC is the encoder of choice because it combines high speed interpolation with impressive metrology performance making it suitable for even the most demanding applications. A wide range of encoder configurations are available so that the user can optimise the speed and resolution of their system depending on their motion control requirements. Furthermore the VIONiC readhead works with both linear and rotary scales across a range of accuracies. The VIONiC encoder is quick and easy to calibrate, meaning it is suitable for volume production.

Easy fault finding and servicing

The Advanced Diagnostic Tool is available for comprehensive encoder feedback . This can be used for challenging installlations and fault finding. It provides:

Remote calibration functions

Signal optimisation over axis length

Readhead pitch indication

Limit and reference mark indicators

DRO and lissajous outputs.

Easily removable scale

The RTLC20 scale with FASTRACK carrier system is ideal for applications that need the machine to be broken down for transportation or require the scale to be installed/removed for transit. The scale can be pulled out of the guide rails and quickly replaced, even when access is limited, thus reducing machine downtime.

The ADTi-100 is used in conjunction with the ADT software. It provides comprehensive real-time feedback from QUANTiC™ and VIONiC™ encoders, aiding installation and fault finding, as well as allowing system optimisation.

RTLC linear encoder tape scale from Renishaw combines ±5 μm/m accuracy
with the ruggedness of stainless steel. Two versions are available; self-adhesive
RTLC-S and RTLC for use with the revolutionary FASTRACK track system from Renishaw.

How it works

The VIONiC encoder features the third generation of Renishaw's unique filtering optics that average the contributions from many scale periods and effectively filter out non-periodic features such as dirt. The nominally square-wave scale pattern is also filtered to leave a pure sinusoidal fringe field at the detector. Here, a multiple finger structure is employed, fine enough to produce photocurrents in the form of four symmetrically phased signals. These are combined to remove DC components and produce sine and cosine signal outputs with high spectral purity and low offset while maintaining bandwidth to beyond 500 kHz.

This evolution of filtering optics, combined with carefully-selected electronics, provide incremental signals with wide bandwidth achieving a maximum speed of 12 m/s with the lowest positional jitter (noise) of any encoder in its class. Interpolation is within the readhead, with fine resolution versions being further augmented by additional noise-reducing electronics to achieve jitter of just 1.6 nm RMS.

The IN-TRAC™ reference mark is fully-integrated in the incremental scale and is detected by a split photodetector within the readhead. As the diagram shows, the reference mark split detector is embedded directly into the centre of the incremental channel linear photodiode array ensuring greater immunity from yaw-dephasing. This unique arrangement also benefits from an automatic calibration routine that electronically phases the reference mark and optimises the incremental signals.

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